naturalistic observation

placebo effect

experimental results caused by expectations alone; any effect on behavior caused by expectations alone; any effect on behavior caused by the administration of an inert substance or condition, which is assumed to be an active agent

dendrites

axon

myelin sheath

insulating material that encases some axons; speeds up neural transmission because the impulse is able to avoid all the gates in the myelin covered part of the axon so they can jump from one node of ranvier to the next